[Zope-Annce] DirectoryStorage: data loss bug

Toby Dickenson toby at tarind.com
Tue Nov 9 16:42:17 EST 2004

DirectoryStorage is a robust, manageable, fault-tolerant, scalable storage for 
ZODB. http://dirstorage.sourceforge.net/

A bug has been discovered affecting all currently released versions, which can 
cause data loss when packing.

A necessary condition for triggering this bug is for some storage files to be 
owned by a uid different to that of the storage process at the point the pack 
is run. This scenario will not occur naturally during normal operation - no 
storage will be affected by this bug unless an administrator has been 
manually changing ownership of files or processes.

All damage caused by this bug can be manually undone using DirectoryStorage's 
delayed deletion feature, provided the damage is discovered in time. In the 
default configuration, within 10 days of the pack that caused the damage. For 
more information see http://dirstorage.sourceforge.net/FAQ.html#deleted

The damage will appear as a POSKeyError when accessing damaged objects. All 
damage caused by this bug can be detected using DirectoryStorage's checkds 
storage checking tool. If checkds finds no problem then your storage is 

Please raise any questions about this problem on 
dirstorage-users at lists.sourceforge.net. Fixes will be made available shortly.

My apologies to anyone inconvenienced by this issue. Thanks to  
Matt Hamilton for uncovering the problem.

Toby Dickenson

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